Abstract: The display control method for an electronic device with a foldable screen according to an embodiment of this application includes: The electronic device determines a first use posture of using the electronic device by a user, and locks a first screen in response to the first use posture; and when detecting a photographing scenario of a camera and a flip operation performed by the user of the electronic device, the electronic device detects whether an object approaches the electronic device, and in response to a detection result, switches from performing displaying on the first screen to performing displaying on a second screen, or maintains the first screen on and the second screen off. In embodiments of this application, intelligent screen locking or automatic screen switching can be implemented based on different application scenarios, to implement an intelligent terminal device, and improve use performance of the terminal device.

Abstract: The present invention discloses a serum-free medium for full suspension culture of MDCK cells and a preparation method of the serum-free medium. The serum-free medium for full suspension culture of the MDCK cells comprises basic metabolic nutrients, nucleotide, vitamins, inorganic salts, a shear force protective agent, a cell clustering resisting agent, a pH buffer agent, a pH indicator, an influenza virus proliferation accelerant and other additives. The preparation method of the serum-free medium for the full suspension culture of the MDCK cells comprises the following steps: 1) preparing a mixed solution: dissolving and mixing raw materials; and 2) regulating pH: regulating the pH of the mixed solution to 6.3 to 6.7, and setting a constant volume to obtain the serum-free medium for the full suspension culture of the MDCK cells.